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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb2bfec9c7e42fc1ea60069cbd732c646e62bd138ad16a51c860747f3c11fc9' 
  AND token = 'yQ574K1JeLM0gRJgWktDusDKTomuH+ZsQdMSS8dHn8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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