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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde9ebc65a02d2fef0f32d3e629ad3092320652e0787ca520ee2a3f4357629ce' 
  AND token = 'FkH+nB/dv6bJzptitf7fur+gjNBevAZEd+nI2ofIp2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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