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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d5f9ebc4e99a0e29fe4eae07702cea37ebd45eaa71e0bbff29ba6355e4aa1b' 
  AND token = 'KKS14+fP2h51AoC+IEC7kF1jWu5JPAkmrje2VdTDDRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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