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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f90dc88ac0332c39aadefd3eac1f63b0c553bb230264c9138e40c8accf34c3' 
  AND token = 'zU2wb+SKJbLPF674PEoJnqSLB4zWO2GCtl8XGDpONN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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