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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e48bad1017bd06c92460410edbdf2650a1e2407ad0a89c2a2e7dac2d5aa59c5' 
  AND token = 'j31tkok4UXyZfrAYrOvgN45LB2QQZLsa9o38nyxumJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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