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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67da49a34a32ae1b79452bdb8f6dab78547db74d2276cf8cb90589ac25f6b1b7' 
  AND token = 'bmEJCwD10VrSNS1NdFMrTXC3tuj4pjF04QN23oOheAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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