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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23467912e202496d4bbbe2d0a027967237a65b512f4d9c8b94f2e6ccacd5873' 
  AND token = 'tZVmt0NyQL9CmydRYwejMIGFCxfoL91K3eUL8QhS3PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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