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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4283d0bd7f492cfcde504b9dea454c59878159ff3f5ef77b6d2f4f498bf63c8a' 
  AND token = '8M4Vu3GVTor1l8fH6JVX00+eTYhDz1UcETIt0kpO43s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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