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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0075e927bed13efd65451e9489e3d31e9503ca65285295bf4249b5e22e3ed8' 
  AND token = 'v7mp0P29kFCgdHOeKyvlcTUYqrX4tDsLn95nuYQVo1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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