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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee22c6a378a97d6c603a3a0ed2d8c9f0058bbc9f0e7697f1874e1b9a2f58cbbc' 
  AND token = 'dxUIx7gIy9z6tvBNaUhj4MATNzH1XuE5x4vI/voU7Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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