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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c836db876d738032697cd5042601c7ebfc016cff9428c024b37480333590be' 
  AND token = 'eohF3LMzkqouSLeCbtzn49/XOq4aA5dz0rP0k3XGlks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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