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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f82ad2694b330e4e44af9cf687123d0b2389b9d128560308b1e4ec8359263b' 
  AND token = 'r/ZyKp/OtSfJHCXSFhWtvPXbl8t/q7l3GNVPx460ak0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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