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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8655db21d4adabd95740eaa8deb31cd32fad7376641669a533de692e044a165' 
  AND token = '2fe89h+X+9J8bbegkzhBd4siok9trpGlBUa24tEi+U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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