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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa176455e411aff8783496aae56fef930c4a3136ac0214b961b4e14b04c2da32' 
  AND token = 'u1Du0NcNjjOPn5t36596nQ7yY7oIx/lv8oB3XQoc76A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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