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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b1085e3c2ee0a0648aff87ce4a18965a43a430f08e1bcb9c6f25a0cda4e85b' 
  AND token = 'e+2np0ohQUiwejU2eCoS5Ti7O6hdTqmyUneS+DPkqz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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