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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e479c39e05cde245264011513e0e8a7ce478e86d7c14f13806da69c07f6d5719' 
  AND token = 'tuwM1emL73rfX/GHtsHP0+vaBK4cnOknpzJW4fw4M4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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