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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143ff92ca93746117d779fde283fd451a9c872135624abf36f46f49b08cd1660' 
  AND token = 'y0ktFd+M+JBy9pb0RdYpWWjmq2if4F9femNVYPgvyR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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