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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb287c36c405921c63de3ba311d4e0b6e892f41fce8f525ea9f8d7287330f9c' 
  AND token = 'KYv543QCylM0Nf+6E9HnO77I8XN51rN7sk8YRHgzl4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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