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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7bd99f4d3f8b1fcb138815b6677d792be9c12da082d85ecf6e8eccd9333a70' 
  AND token = '/CN7DUfdip0gzp0GdmNapIoP6NHqW/Smsf00AAkD3yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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