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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a8e701a8280d786752cb2171e5513813adde92515b7a63d6f7fc058aad219a' 
  AND token = 'DFg+xiVg4hImMxs800cozdKEY9SQYoDSMMcCHA3rV+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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