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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d6098cba6bcd95a07fe82c9d4700e0da3a2aca5b0ac11eaf4c7ab1092673de' 
  AND token = 'b5DNAGQUDgocsUA/Uf9tGGgE0EFNxDYt0B+AmCmBecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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