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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ef837885b65147310c16ee62a69f32578d717e0f6a642a48d8c56976809c9b' 
  AND token = 'tCEWExhnz4eisiDnmla4kgHsFufCP6nEl/Tlm+nyYAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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