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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bef7bc43a36c72cae094235a0f6f14a8854cf4bf8a39ae56bbabe2e2b843bd2' 
  AND token = 'uuZELRDchrN0kdKNIjonSVM0wQ3LJIiLKJsXd21pV6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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