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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2987819a3a1b29720ea3f188e9cd1bb0da27a3b27336eb4538a2e7b0a39aea28' 
  AND token = 'mTjr8rq5jlo2G1aVwOQWBTkkPgul/vheJV21NVMTLdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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