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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdef2678fb7318621225f1082c60f3d5764243026dc9ec6875c1cc3f7ca0d54e' 
  AND token = 'xsyqQOu2W3QijkB7Cp3HIRO36Gg/VojFsVy8L921V7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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