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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929b0b5e106d2055b15278d6a67aeac4548ed5068e23e57ab2072cbb674f60c9' 
  AND token = 'NqKsPBYRxJ1QG37GRBtekyzAa/Y6ZUdJ4Gs+eXzcTd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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