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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c0828e45f1d9c31c7e47d2adaa0ce162adaebbbfccdc640359de56bec8e2b6' 
  AND token = 'Tdl4Yw8KzLN+eEQ7x+ZJLvYlnNoeYTNpCJaxB8a1mN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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