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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8b86d1d71676d447d8f85d0b8dab410a97edcd627e7c68c2a11523f06b67fd' 
  AND token = '5Hi9Bn2wmdLTDhawpVWEWrEv47CuKq50hz0IL3q/s5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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