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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd27214dae8e90944923e196739a811169933f7ea97f1c8ca2d77c23194f790b' 
  AND token = 'FQ2Hs8/Qk7+T7Aneku9HLHk44CwPMp5OwhE7mvDp9/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}