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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1fd390bf5ba7ba93d150c42a680bbfbb5c4b1c945e2a7f889412c8c8ad75f5' 
  AND token = 'KkfKBM5ijOmLyRJbH3apC/fFsHGxk9ZYN3QU39i5XxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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