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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7845a8d9e4db9945b6bc064ac7a1c8f02e4e464f834e5d472b08b9bc0d56a62' 
  AND token = 'pviExNfUuXk3igrMZny3VYoUN+hwvsb4BTO0AuKsWkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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