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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99533caacd0d37098908fa209599052380fdfb2beeafaf556e96a6708f52cc8' 
  AND token = 's1GvFY7wJmglYnWjxwIPdaunqF5k8UMV+P8jPF2TYiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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