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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aef87db491701bbb1141720841ea0ab701039ad56ce0a46426ba295d48ee86f' 
  AND token = '8IGLYqknV9buLuMdBSPc8RxfFYrVpQm0lAkeoAEfIHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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