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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78dda265add2d1ac0c1d9fa63e56835318a91d2f4f86b413abfd33726726bd1e' 
  AND token = 'YW9/ZaTibkzSMUdV/8aaRiMCvEAuiAgM7PNnKXmPevE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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