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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b100854a9189ab4e9ef535cdb6d7a785a67bb959f31ff9ad040cce7e547c2f57' 
  AND token = 'cAMhIoZpbnyeCR6zhhRca/pTz8K/ABC1olWlhBScJaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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