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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3803534e2ab74fc4064e9d54baebd4e9d8029797dc4ce67780448eb5829e350c' 
  AND token = 'KvmMAOmZa98z2wzYw2OoyK4Tsva2mzvKGnAu2gDvxFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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