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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b84e3d285b367479f26e1edc2b58eb52acc3349945903cabcca230df2ea39e' 
  AND token = 'HCr7QeFHN4ngt+pzQC6+i1yu5ygvG8wEri9OXo3j+is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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