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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98085eefdfd69161b1d2d74cce211a926293a85618cba8effcb4c05bc9d4b3d0' 
  AND token = 'j90NjbIST5IAok6U4tyx62H+IAAxOb7TnMoMgDolzAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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