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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fafb67ef1eeb8029da934846ce1add5a45fea696720cf12ac82878ef9f69ae' 
  AND token = 'ZhiWGUTzijMdLsEOqW/iYVhucIKihrpDRGSL+i2sc4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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