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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8346bc116eb351421ab51cfc280943c6b35a0f399b9c20a12528be270031757' 
  AND token = '3B3uliS6+emtqRlXtQPYp2m8M2CRR58mmQa06fdHno8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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