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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1ae8fe8717b2d46aa4cc00158d0d2ccfc3d1532ca193dfacab9d1744175d52' 
  AND token = 'MCjyzvJLagDPD/e+FrRf9tfesiLAL1cTY39/6RnacMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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