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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c176b6185c485e418a75a6131e1cafd09248934f9fe80cc9e3d6e9323317b54' 
  AND token = 'cSyBJzne7B+ag7iKG7JZX4evnby63g7FLcvoeRlT8Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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