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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4482fdf3c3ca0ba64809e82af03866f7bf09a639a2b84716d5c63eb4904e97' 
  AND token = 'XLcXV1251QMRyEPxhv1/hFTHfXi4sgIKjnZSbguPxSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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