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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cdfc1f7b62f8f1b3f0bc0ae5f0950ba1e80cebc21909befc3543008494f5b6' 
  AND token = 'MDWhvYkDM1KzPLVJDxJ+kde0suO5s3RrDhtHGz6RBF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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