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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8800dc61bb0a94dae3f0c06f26353d140c4d4123e12c7cd4ebc59e0541e04398' 
  AND token = 'GFk4ZdAoFdgt8dfIV8GxL9vowl3ck59qRU8iSOYeN9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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