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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08db37fb4676d9661d1245a1d41f1a1355ea06e031d5f27748667d231402a03a' 
  AND token = 'eY5SKrahyBHKP+/QUUkDScY2uPhXkbO8ebtckDOtyZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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