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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8a5dee0d0b0a5f128338d52517d92c62d6edd559517e6c0ece535ac644a48f' 
  AND token = 'wZVov04iQlntbqZPIFI4Medt07dm7dV7UtPDMdUsTBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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