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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59e22a2f5f88a9ef8ed282e51d1aeba5414e6c6e68d495f3bdb5349f029e76b' 
  AND token = '2elWdk9wgpggwp4245BC4EOX+WWbN/Hv/wbl53XtLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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