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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09293626387caf5e746fad925cc5fdfa84380471ef088534e905000c1a03c47c' 
  AND token = 'z9RQJLp0vxq6g3blTEyomyZiW11Kcb9nfsTFieyKlJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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