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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec952420907898150a7ed7cb865e8424b13095a48202e8ffce6a37a5db59646b' 
  AND token = 'zdwPjgkhxnjIr0aXYW9coD3y3UmnGzCvHz1yF9alDC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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