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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4c608be70c8fda19b1ebabeeb9ceb08c143e803d01abf16848234431f21c90' 
  AND token = 'RHPfB4puLDtLPQvb6oiBWPn9t5V9OsKqcwBU11J7GEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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