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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86292a678a62d7be1ce4b0f95652e521e2a50fce94840e68af3bee05b74164b2' 
  AND token = 'O410fKi047SKZcMlZ/POSQU+sACuysfv1Kv66I23HaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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