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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820046c054403c5e61c690698560390b3dfcac04fbd9922a0af1094a137c9739' 
  AND token = 'hDAEdbaiSipWGmCTaYjdGZG3vWONX1asSt1wtE4U+Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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