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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de788f7635aebc409148c4baa3cceb59381ed1c02537de4d6df227c0e9cd134' 
  AND token = 'a2DBm/Ci/hj01omiX5hayLXM0QaohlFGns2CKT7m08Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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