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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded233c524cc29d78f99b0f583cfd7d5311507be2cd9e26a82c81b70dba4f883' 
  AND token = 'Yo2Rio0nNOSFT7ar41e28kr1UL2aORZTVAX4C786hU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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