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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a7d928efdc67a1170287b4f8e0baa2ce0a2e0e66c1d6b0fed1e61e27d8ff33' 
  AND token = 'iCQpYcQERewD7nx8RG0e4dJmnLzia+0dQO3mPC/iO2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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